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19.3.2 Logical Pathname Components

19.3.2.1 Unspecific Components of a Logical Pathname

The device component of a logical pathname is always :unspecific; no other component of a logical pathname can be :unspecific.

19.3.2.2 Null Strings as Components of a Logical Pathname

The null string, "", is not a valid value for any component of a logical pathname.